666789149 has 16 divisors (see below), whose sum is σ = 731989440. Its totient is φ = 603626880.

The previous prime is 666789127. The next prime is 666789163. The reversal of 666789149 is 941987666.

It is a cyclic number.

It is not a de Polignac number, because 666789149 - 2²⁴ = 650011933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666789094 and 666789103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666789169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449489 + ... + 450969.

It is an arithmetic number, because the mean of its divisors is an integer number (45749340).

Almost surely, 2^666789149 is an apocalyptic number.

It is an amenable number.

666789149 is a deficient number, since it is larger than the sum of its proper divisors (65200291).

666789149 is a wasteful number, since it uses less digits than its factorization.

666789149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140.

The product of its digits is 3919104, while the sum is 56.

The square root of 666789149 is about 25822.2607259705. The cubic root of 666789149 is about 873.6339605471.

The spelling of 666789149 in words is "six hundred sixty-six million, seven hundred eighty-nine thousand, one hundred forty-nine".